[3 + 2]-Cycloaddition of Azaoxyallyl Cations with 1,2-Benzisoxazoles: A Rapid Entry to Oxazolines
作者:Juan Feng、Ming Zhao、Xuanzi Lin
DOI:10.1021/acs.joc.9b01166
日期:2019.8.2
novel and efficient [3 + 2] cycloaddition reaction of azaoxyallyl cations and 1,2-benzisoxazoles to give oxazoline derivatives has been developed. The transformation provides a rapid entry to functionalized oxazoline scaffolds under mild and transition-metal-free conditions, which will greatly expand the reaction types of heterocycle chemistry and pave the way for syntheses of bioactivecompounds.
The use of Ph3P/DDQ offers a novel, neutral and highlyefficient method for the efficient conversion of 2-hydroxyaryl aldoximes and ketoximes to 1,2-benzisoxazoles in excellent yields at room temperature.
Ph 3 P / DDQ的使用提供了一种新颖,中性和高效的方法,可在室温下以优异的收率将2-羟基芳基醛肟和酮肟有效转化为1,2-苯并恶唑。
Ring opening [3 + 2] cyclization of azaoxyallyl cations with benzo[d]isoxazoles: Efficient access to 2-hydroxyaryl-oxazolines
作者:Yicheng He、Chao Pi、Yangjie Wu、Xiuling Cui
DOI:10.1016/j.cclet.2019.09.025
日期:2020.2
Abstract A selective ring-opening [3 + 2] cyclization reaction of benzo[d]isoxazoles with 2-bromo-propanamides has been developed. The azaoxyallyl cation intermediates are employed as C∼O 3-atom synthon to build oxa-heterocycles via the selectivity of suitable cyclization partners. This transformation provides rapid access to highly functionalized 2-hydroxyaryl-oxazolines under mild conditions and